Stop-motion mechanism for sewing-machines.



D. NOBLE & J. S. FINGH. STOP MOTION MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DBO.19, 1906.

Patented Dec. 10, 1912.

6 SHEETSSHEET 1.

INVENTGRS DONALD NOELE AND JOHNS. F/NGH THE/R A TTORNEK WITNESSES:

' D; NOBLBG; J. s. FINCH. STOP MOTION MECHANISM FOR SEWING MACHINES.

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N1 "HUM!!! u 2 'OJ/OXL A ZLQZFE WIT/V588 8-" AND W 46. ,Jo/w S. FI/NCH,MIL; m

- THE/R A TTORNE Y.

D. NOBLE & J. S. FINCH.

STOP MOTION MECHANISM FOR SEWING MACHINES. APPLICATION FILED 1330.19,1906.

1 41111; Patented Dec. 10,1912.

6 SHEETSSHEBT 3.

FVI'TNESSES 1/v VENIORS, Mm? 4K DONALD NOBLE v AND Y JOHN S-FI/VCH.

T E/RAITORME'X APPLICATION FILED DEO.19, 1906. 1,047, 1 1 1 PatentedDec. 10, 1912.

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WITNESSES: lNVzF/VRJARS 0 04/6. 0mg 12 NOBLE v JOHN s. F/NC/f- QIJMAI.

THE/RATTORNEY.

D. NOBLE &-J. S. PINCH.

STOP MOTION MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DBO. 19, 1900.

6 SHEETSSHBET 5 O 45 I9 I a WITNESSES. 1 [NVENTORAW M46 DONALD NOBLEwoH/v s. F/NCH ,WflZLMTJ THE! R A TTORZVE Y.

Patented Dec. 10, 1912.

D. NOBLE & J. S. FINGH. STOP MOTION MECHANISM FOR SEWING MACHINES.APPLICATION FILED DBO.19, 1906.

6 SHBETSAHEET e WlTNfiSSES: INVENTORS Whit DO/M2790 NOBLE SU /MM 2- I yQJIOH N THE/RA TTORNEY.

Patented Dec. 10, 1912.

UNiTEnsrAT s PATENT o' E o DONALD NOBLE AND JOHN "s; EINQH, OFBRIpGEron-Tj. co NEo'rIctiT, QSSiGNOBS, 'BY MESNE ASSIGNMENTS, To THESINGER MANUFACTURING COMPANY, A CORPORA- TION OF NEW JERSEY.

s'roPuuo'rIoN MEoHANIsM FOR SEWING- ACHINES.

Patented neezib, 1912.

I f Application filed December 19, 1906. Serial No. 348,619.

States. residents of Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new .and useful Improvements inStop-Motion Mechanisms for Sew-.

ing-Machines, of which the following is a specification.

This invention relates to improvements in stop-motion mechanisms, andone of its pbjects is to automatically slow the speed; o f a drivenmechanism, preparatory to br nginginto action' the mechanism forarresting the action of such driven mechanism, by the em- I 'ployment ofmultiple belts driven at differ:

ent speeds and coacting with a stop-motion pulley and a loosepulley-said stop-motion pulley being provided-with multiple beltdrivingsurfaces, said belts being automati cally controlled for positioningthem relatively to. the several belt-driyi'ng surfaces whenadjusted toslow the speed of the machine.

Another object is to provide the shaft upon which the stop-motion pulleyis'mou nted with opposing elements located on opposite sides of amechanism which, when actuated to stop'the machine, tends to force suchopposing elementsin oppositedirections, thus relieving said 'shaftgofend thrust when brought to rest by the action-of the stopping.

mechanism, and when operatively connected with the soul'ceofower Afurtherohject lsto IIHPIOYO such const action so as to: better adaptlift O the reqr remtmts' ofswing machine productions.

To the accompanyingdrawings illustratin the several figures of similarlydesignated.

of ab'uttonhole s'ew- 'elevatidn of F on the'lnie (1 21 Fig; '0 is a'vie w partially .insection oh with our invention:

the line G-H;'Fig. 2; Fig. 7 is a rear end elevation, similar to Fig. 3,together with the main driving shaft- (in section) upon which aresecured pulleys ofunlike diameters for transmitting to the actuatingmechanism of the button-hole sewing machine comparatively slow and fastspeeds.

Our invention is herein shown and 'described as applied to a lVheeler &\Vilson huttonhole sewing'machine, but itis to be understood that it isequally applicable to machines for effecting the stitchingor-overseaming of a predetermined design or figure,

such machines, for instance, as are used for sewing on buttons, workingeyelets,'stay1ng seams and securing straps to under garments.

Many of the features of our present invention are similar inconstruction and operation to those of thedevice shown and described inU. S. Patent No. 656,853 issued to Donald Noble to which reference maybe had, except that our present construction has been improved so as tobetter adapt it to the requirements of greater speed.

1 is the base of the sewing machine and 2 is its standard. 1 is theoverhanging arm. and 4 is its base.

5 is the, main or needle-bar-actuating shaft and 6- is theloop-takerdriving shaft, said shafts being operatively connected by anupright shaft 7 and bevel gears 8, 9 and 10, 11, the two latter being ofthe -ra.tio,'of't\vo to one, thus giving to theloop-taker wo revolutionsito one complete; actuation of the .needle-carry ng,bar;

12 "is an iupright.gha ftljo in a bracket and ope; ativel i],corinect'ed with the. needle drivingsha-ft 5hr? gears' l4 and wait t vto one. thus giving 'to the shaft 12 one-revolution, totwo revolutions11 0f the peedle ba r a'ctuating shaft 5:' -='l o the lowe 11doftheshaft 12 is secured steed, eceent cQl-(i' andan overseamingeccentric 1T wliich,1t ln' o1'1ghsuitable conneetions(notishown),transmit to the clothholdingcla-in x: its step ;by,= step;feed move- "hUttOllliOlttiu. and: the 1 ai'eeessaryl: xgibratory all 'seam and barring stitches. To the vertical shaft 12, directly abovetheeccentric 17,'is secured a gear 18 which through suitable connections(not shown) transmits motion to the gear 20 which-is mounted on a-hub 21secured in the bracket 19. Said gear 20 car- .ries a cam-driving disk 22which, at a predetermined time, transmits motion to the barring cam 23to which is secured thecon- 'troller cam 24, said cam being provided atits upper side with a belt-shifting cam 25 and tripping dog '26. Thedrawings illustrate a second dog 27 which is important to the control ofthe time at whichthe'cutter for cutting the buttonhole slit shall beactuated but not essential to the herein de-v scribed invention;accordingly, in the fur 'ther description of our invention reference"will be made only to the dog 26.

clutch-collar whiclrlatter'is secured upon a tubular shaft 34 mountedupon a second tubular shaft '35 which, in turn, is-mounted upon arock-shaft 36. 1

37 is an operating lever fast upon the tubular shaft 34 and carrying atits outer end a rod38 which slides freely through a pivot pin 39. Therod 38 at its lower end-is attached to any suitable treadle connection(not shown) by which said rod may be opera-ted to start the machine.

40 is the cloth-clamp slide mounted in dove-tail ways 41-formed on thefeed-slide 42, said feed-slide being similarly mounted in dove-tail ways43 secured to the underside of the base 1.

44 is a post rigidly secured to the clothclamp slide 40 and passesthrough a hole 45 in the upper hinged section 46 of the cloth-' clamp,said hinged section being pivoted at 47 to :1 lug 48 formed upon thecloth-clamp slide 40. Interposed between the upper face of the slide 40and the underside of the hinged section 46 of the cloth-clamp is .a

spring 49 bymeans of which said section 46 1s raised above the materialheld in the cloth-clamp.

- 50 1s a cloth-clamp-clo'sing lever provided with a cam portion 51,which latter bears the upright shaft'-12, gear 18, hub 21, gear 20,camdriving disk 22, barringcam 23,

controller cam 24, slidable connection 54,. and barring lever 55, whichlatter is oper at-ively connected, through suitable connections'(notshown), with the lever 56 which is pivoted at one end to the bracket 57secured to the bracket or truss '19. The opposite end of the lever 56 isbifurcated to receive' the eccentric17 which gives to said lever itsvibratory movements which, in turn, are ,transmitted to the cloth-clamp-.through the connections referred to.-

58 is a link connected at its lower end to the cloth-clamp lever 50 by apin 59, its opposite end being pivotally connected, by a pivot stud60,110 a lever 61 fast 'on the tubular reek-shaft 34.

62 is the needle carrying bar, 63 the needle, 64 the needle-threadtake-up and 65 is the needle-thread tension device.

The foregoing is descriptive of the clothclamp and so much'of thecloth-clamp actuating mechanism as is deemed necessary for a properunderstanding of the application of our i'nvention,*and comprises thesame means and the same methods of operationas are fully illustrated anddescribed in our pending United Statesapplicat-ion for improvements inbuttonhole sewing machines, Serial No. 348,618, filed. December .19,1906, to whichreferen'ce may be had. for a more detailed description ofthe parts previously referred to and their functions. V

- It'is to b'e understood that the controller cam 24, as in thebuttonhole sewing machine application-above referred to, is given onecomplete rotation during \the overseaming of the sides and the barringof the opposite ends of the buttonhole, such rotation consisting of twosemi-rotations, one for each barring operation.

, 66is a cam disk rigidly secured upon the shaft 5 in any suitablemanner, as by a key 67. Upon the hub 68 .of the disk 66 is looselymounted a stop-motion pulley 69 which 'is provided with an internalfriction ring 70 secured fast to said pulley 69 between the disk 66 anda yielding disk 71, the latter being secured to said first mentioneddisk 66 by screws 72 (preferably three in number).- Interposed betweenthe heads of the screws 72 and the bottoms of the tion pulley 69adjacent to the pulley 77 and similar in cross-section tothe belt grooveformed in eachof the pulleys 7 6 and 77.

7 9 is a bushing rigidly secured in the rear end of the arm base 4 andsupporting the bushing 80 within which is journa-led the Shaft 5, saidbushing 80 being held in place with a shoe 100 adapted to 'engagca camin any suitable manner, as by the usual set screw (not shown). 81 is ahub 01- ;ring formed on the bushing 79 concentric with the shaft 5 andbushing 80. F ittcd around said hub Slis a toothed disk 82, the inclinedsurfaces 83 of said teeth being adapted-to match and coiiperate withsimilarinclined surfaces 84 of complementary teeth formed on a brakedisk 85, which latter is interposed between said disk 82 and the camdisk 66.

8G is a friction ring tpreferably of leather) fast to the cam diskhG,against which ring the face of the disk 85presses in' the act ofstopping the machine. The disk 8213 held against rotation by an arm' 87formed integral therewith in the end of which arm is fitted a stud 88through which passes transverselyamadjusting screw 89;-

Said screw .89 is journaled after the mannerof a swivel in the end of apost 90 secured in the arm base 1'- in'any suitable manner;and-byturning said screw 89 the disk 82. may be adjusted axially aroundthe huh 81 over which it is fitted.

91 is a resistingflange tighten the shaft 5 and hard against a shoulder92 formed thereon.

93 is a brake ring supported in position by shouldered screws fiattapped therein (preferably three in number) and which pass freelythrough the holes 95 in the bushing 79' and bear against the back of thedisk 82. interposed between the ring 93and the flange 91 is a frictionwasher 96 (preferably.

made of leather).

Formed on -the brakedisk 85 is an ear 9? to which is pivoted M398 thereleasing lever 99. Said lever 90 is provided with an upper horizontallydisposed arin proiecting beneath the cam disk (36, which is providedstep 101 formed on the periphery of said disk 06.: f

The operation of the toothed disks 82 p and 85 with respect to theeanidiskjfiG is precisely similar to theope'ration of the g Inrunning'position; the block 102 occu pies the upper. portion ot the canslot 103 analogous parts shown and described ini U. S.Patent'No.G56,83,previoiisly referred I to'; but since theefficiencyiofthesefparts has i been greatly increased by 6111-aidditii'nlal iniprovem'ents we will," for the purpose of a-' clearunderstanding, describe such -older tea} t tres of construction inconnection with the elements which we haveadded.

in the lever 104, with the shoe withdrawn outside the path of rotationof the camstep 101. In such position there is no pressure in oppositedirections between the disks'82 and 85, the latter-beingcaused to backaway fioin the cam disk (36 by the pres sure of the springs Tibehind theheads of the screws 72, between which and said disk is interposed ahardened washer 105 to prevent undue wear.

outwardly slightly beyond the surface of the friction ring 86, and 'inassembling these stop-niotion parts the cam disk 66 is set in suchposition on the shaft 5that when the toothed disks 82 and 85 areclosed-together,

said 'camdiskfiG and flange 91 will turn "within the path of rotatioi'iof the cam step frictioh' ring 70 car 101 by the action of the cam slot103 on the block 102, causing said. canistep to strike said shoe 100 andtend to force .it away, which action is resisted by the "hape of thelower portion of the slot 103 in said lever 10-l.- The cam step 101being unable to force the shoe 100.:nvay,ith ei"eby causes thelever 99upon whichsaid shoe is carried, together with the disk 85 to which saidlever is fulcrumed, to be rotated for a short distance. During suchslightrotation of the disk 85 the shoe 100 will slip-partially up thegradual incline of said calnstep 101.

The slight rotary action thus imparted to the disk 85 causes the latterand the disk 82 to be spread slightly apart, the complementary inclines83, 84 of the teeth formed thereon effecting such'spreading, as will bereadily understood. As the disks 82, 85 are spread apart, the latter\vi-ll'be forced against the friction ring 86 on the rotary disk 66, andthe formenthrough the screws 94, will force the brake'ring93 against thefriction washer f lhsqueezing the latter between said ring and theflange Simultaneously with such act on, the screws-72 W1ll be compressed againsttlie springs 14-, thereby releasing the 'ied by thestop-motion pulley fiflhfro n' being gripped between the disk andcarnfidisklifi', tins leaving said stopfinot'ion" piillev 09 free torevblve as the machin ls'brought to rest, "which is efi'ected 'by'the'it'riction supplied in" forcing the disk 85 against the ring 86andthe'non-rotatable' rin 93 against the" iriction washer J6 and.

the action of the cam: step 101 on the shoe 100. It will be observedthat thef-lateral pres- In released or running -p0sitionthe heads of thescrews 72 pro ect sure supplied in forcing the brake members against therotating members is exerted upon the same in opposite directions, and

that therefore, no end thrust is produced on the shaft, which is a verydesirable condition. Also, by reason of. the friction ring 70, carriedby the stop-motion pulley 69, being gripped in opposite direct-ionsbetween two surfaces when actuated to drive the machine there is no endthrust of the shaft 5, which results in great economy of power.

- actuated to stop'the machine, as at the completion of a buttonhole.

The different speeds' are effected by two separate belts 107, 108 whichrun from driving pulleys 109, 110 secured upon the power shaft 111mounted in s'uitablebearings in the hanger 112, the shaft 111receiving'motion from any suitable source of power. The

belts engage at different times the belt-groove 78 on the stop-motionpulley 69 and the pulleys 76 and 77, as will be presently set forth.

113 is a belt shipper provided with a forked end 114 adapted to engagethe belts 107, 108, said belt shipper being secured on .-the upper endof a short vertical rock-shaft 115, which latter is journaled in theouter end of a bracket 116 secured to the arm base 4 in any suitablemanner, as by screw 117. Upon the lower end of the vertical shaft 115 isformed a crank-arm 118 to which is'pivoted at 119 one end of a link 120.The other end of said link is pivoted at 121 to a lever 122 pivoted at123 to the inner end. of the bracket 116. Carried on the end of saidlever 122 is a roll 124 adapted to be engaged attached to the link 120at 127, while its other end is secured at 128 to the arm base 4,

the tendency of said spring bein' to keep the roll 124 on the, end oftheever '122 pressed in a direction to hold the belts in' operativerelationship with the groove 78 and loose pulley 77.

129 is a stop-pin, carried by the link 120,"

mechanism is.,as follows: .As previously alluded to, the machine isstopped on the slower of the two speeds, delivered by the belt 108 atwhich time said belt is in engagementwith the tight pulley 76 and thehigh speed belt 107 is running upon the loose pulley 77. Soon after themachine is again started, the roll 124 will drop off from the end of theguard-rail 125 by the action of the spring 126, thereby causing the,belt shifter 113 to be moved toward the left, which action shifts thehigh speed belt 107 0d from the loose pulley 77 and into the groove 78.At the time that the slow speed belt 108' is shipped -'from the tightpulley 76 over onto the loose pulley 77, the

cam 24 has entered upon the second-half of its rotation. Soonafter saidcam 24has started upon the second'half of its rotation, the beveled'end25 of the camguard-rail 125 will engage the roll 124 and cause the beltshifter 113 to be moved toward the right, which will cause the highspeed belt 107 to be thrown out of the stop-motion pulley groove 78'-andonto the loose pulley 77 and at the same time the slow speed belt'108will be thrown off from'. the loose pulley 77 and onto the tight pulle76,

whereupon said belt 108 willact asarake to reduce thevelocity of themachine to a point equal to the speed at which said slow speed belt 108is traveling. 1

Automatically reducing the speed of-th -maehine preparatory toautomatically'stopping it is' a highly. important feature with respectto durability not only of the stop mot-ion mechanismbut the mechanismwhich it controls.

J ournaled in hearings 130 and131, formed on the lower portion of thearm base 4 at the rear side of .the machine, is a rock-shaft 132 whichhas secured tight on one end the lever 1323- while fast upon the;otheren'd is a lever 134. The lever 133 is provided at its free end witha roll 135 which coact-s with the under edge of the lever 37, while thelever 134 is provided at its end with. a stud 136, upon which latter ispivoted one end of a link 137, the other end of said link being pivotedaround the stud 138 carried on one end of t he lever 104 pivoted at 139to the base standard2.

The operation of our device 'is as follqgvsz'In the several figures theparts are shownin the position which they occupy when the machine is atrest. The machine is started by a movement ofthe lever 37 path of travelof the cat n'step 101 carried by the disk 66; and as soon asthecontroller the tripping Qti'out ofcontact with the dePending-linger'QSthe Spring MO will cause theipaivl 31 ;t o engage; the tooth 32,'- thusholding the lever 37 in the posit-ion shown in its rotation releasethepawi3lfrom engagement with the tooth"3'2.j At the'time' ."that therock-'shaft132 is rocked, by the action of the lever 3 lto'ii'ridyeitheshoe l'-out 'of the range of travel-of the cam'step 101, the lever 99,through connectionwitli the ear --97 formed integral withthe disk 82,and

the action of the c ani slot 103' upon the block 102' carried at the endof the'lcvei' 99,

causes the toothed'disks 82 and 85 to resume their normal or inactivepositions rela-' to grip the friction ring (leather) 70 between the camdisk 66 and the disk 71, thus leavingthe shaft-5 free to be driven bythe stop-motion pulleyfl69.

As the dog 26 in its rotation again strikes the depending finger 28 andreleases the latch 31 from engagement with the tooth 32, the spring 106,through its action upon the lever 104,-causes the latter to bepositionedas in Fig. 3, with the'lower end of the slot 103 in "contactwith the block 102, thus causing thecam' step 101 "to act-upon the shoe100, through which action, as previously explained, the disks 82 and 85are caused'to be slightly separated, the disk 82, through its actionupon the ends of the screws 04, forcing the ring 93 against the frictiondisk 90, thus arresting the-action of themachine, and the disk throughits action upon the heads ofthe screws 72, at the same time forcing thedisk ,7laway from the friction ring 70, thus permitting the stop-motionpulley and arts carried by it to run free -ipon Lhe shaft 5.

What we claim is y 1. In a stop-motion mechanism, an expandingmechanism, a shaft, 2. stop-motion pulley mounted upon said shaft to runindeendently of or to drive said shaft, a resisting flange secured onsaid shaft, and a:

movahledisk mounted concentrically to and Y rotatahly \\'i(.hsaidishaft, said flange and disk arranged on opposite sides of saidexpanding mechanism, and automatic meansv for actuating said expandingmechanism to release said shaft from the driving control of saidstop-motion pulley and act through the resisting flange to retardthelmotion of said shaft. 7 '2. Ii -a stop-motion mechanism, anexpanding mechanism, a'shaft, a stop-motion pulley mounted uponsaidshaft to run inde pendently of or to drive said shaft, a resistsecuredon said shaft, and a movable "llw mounted wmreutrieally to and rotatably viiths'aid said flange and diskp "shaft andk-automatiemeans-.jfor actuating 1, m dotted l1nes, 'Fig. 5, until the dog'T-26will" said' expandin g :mechanism to; release said Y shaftfrom: thedriving control of said; stop;- motionpulley andact throughtliegresisting flange to retardzthe motion-of saidsha ft, I

3'. In a Fsto'psmotion mechanism, an .e xpanding mechanism, a' shaft, a;stop-motion pulley mounted upon said shaft to run independently of or todrive said shaft, a resisting flangezsecured onI-said shaft, and amovable disk mountedsconcentrically. to androtatahly with saidshafg saidflange anddiSkarranged on oppositegsi'desf of said, expand-1ng'mechan1s1n;-..andautomatic means for actuating saidexpandingmechanism to re lease said shaft from the drivingcontrol. of saidstop-motion pulley and act through the resisting flange to retard themotion of said shaft, in combination with]; multiple belts driven at:different speeds for connecting "said stop-motion pulley-with thesourceIpf power. 1.

4.. Ida stop-motion mechanismforsewing machines, :a stop-motion pulleymounted on the main or driving shaft of the sewing ma chine to .-rotateindependently of or synchro- 'nously with said jshaft;,a. cam disk,secured to said main or driving. shaft, manually controlled fmeans -for,oper,atively connecting said pulley and. disk, means, including. an;expanding; mechanism, for automatically 'oiscontinuing the v operativerelationship of said stop motio'n pulley.- and said disk, andconnectionsbetween said stop-motion pulley and theus'ource of powerincludingbelts driven. at different speeds, in combination withautomaticmeansacting on said belts to reduce the-rs'peed o f the machinebefore. it is automatically broughtito rest. 5. Ina stop-motionmechanism-for sewing machines, means for driving is'aid meclia nismincluding pulleysof unlike diameters, a stop-motion pulley mounted onthe main or driving shaft of the sewing machine to -rotate independentlyof .or synchronously with said shaft, a canidisk secured :to said main,or drivingshaft, means,- including an Expanding. fn'iechanisnnl, for autolnatically discontinuing the 'operative; relationship of said stopmotion pulley, and said disk, in combination \vith.belts for connectingsaid stop-motion pulley u'ith'said pulleys of unlikediameters-incombination with automatic means acting on' said belts toreduce the speed of;.th e machine heforeit "is auto} maticallybrought torest. 6. In a stop-motion mechanism for sewing machines,, a 'stopmot-ion pulley mounted on the main or driving shaft ofthe sewing machineto Trctate; independently of or synehronousl with said shaft, a cam disk'se too cured to said main or driving shaft, connections between saidpulley and disk in cluding a yieldingly mounted disk, means,

including an expandin mechanism, for antomatically discontinuing theoperative re- 10. in combination with automatic means acting on saidbelts to reduce the speed of the madisk secured to the main shaft'ofthe-sew chine before it is automatically brought to rest. H

7. In a stop-motion mechanism, a main shaft upon which is mounted astop-motion Pulley capable of rotation with or indep-end' ently of saidshaft, said pulley being provided with multiple belt-driving surfaces, aloose pulley mounted to rotate upon the same axis as said stop-motionpulley, and a cam disk carrying a yielding disk secured upon said shaftand coacting with said stopmotion pulley to drive said shaft, incombination with belts driven at different speeds for connecting saidstop'motion pulley and loose pulley with the source of power, incombination with automatic means acting on said belts to reduce thespeed of the 'machine before it is automatically brought to rest.

8. In a stop-motion mechanism for sewing machines, a resisting flangeand a cam ing machine, a brake ring mounted independently of said shaft,a stop-motion pulley carrying a friction ring mounted upon said shaftand capable of being rotated with or independently of said shaft, and ayielding disk carried by said cam disk, in combination with oppositelyarranged coacting disks provided with complemental teeth for forcingsaid yieldingly secured disk and brake ring in opposite directions.

9. In a stop-motion -mechanism, a main shaft, a stop-motion pulleymounted to rotate with or independently of said shaft and provided withmultiple belt-driving surfaces, a cam disk carrying a yielding disksecured upon said shaft and coacting with said pulley to transmit power,and automatic means for discontinuing the operative relationship of saidpulley and disk, in combination with driving pulleys of unlike diametersoperatively connected with the source of power and belts fortransmitting power from said pulleys of unlike diameters to saidstop-motion pulley.

10. In a stop-motion mechanism for sew ing machines, means for drivingsaid mechanlsm including pulleys of unlike diameters, a stop-motionpulley mounted on the main or driving shaft of the sewing machine torotate independently of or synchronously with said shaft, a cam diskcarrying a yielding disk secured to said .main or driving shaft, andbelts for connecting said stop. motion pulleyf with said pulleys ofunlike diameters, in combination with means including a cam andbelt-shifting lever for automatically adjusting said belts to change thespeed of said main or driving shaft of the sewing machine. 1

11. In a stop-motion mechanism, a main shaft, a stop-motion pulleymounted upon said shaft to rotate with or independently of said shaft, acam disk secured upon said shaft, said pulley coacting with said camdisk to drive said shaft, oppositely arranged disks mountedconcentrically to but inde-;

pendently of said shaft and provided with coacting complmental'teeth," aflange and cam disk secured uponsaid shaft, a brake 'ring mountedconcentrically to but inde pendently of said shaft and cooperatingwith-said flange to resist the cam action of the oppositely arrangedtoothed-disks, and

a releasing lever provided with a brake shoe which is adapted-to coactwith said cam disk toarrest the action of said main shaft.

12. In a stop-motion mechanism, a main shaft, a stop motion pulleymounted upon saidshaft to rotate with or independently of said shaft andprovided with a friction ring, a cam disk secured upon said shaft andcarryingra yieldingly-secured disk, said pulley and' cam disk, andyieldin'gly-secured disk to drive said shaft,. op osltely arranged disksmounted concentrica 1y to but independently of said shaft and providedwith coacting 'com'plemental teeth, a resisting flange secured upon saidshaft, a brake ring mounted concentrically to but independently ofiction ring coacting with said said shaft and cooperating with saidflange and cam disk to resist the action of the oppos tely arrangedtoothed disks, and a releasing lever provided with. a brake shoe whichis adapted to coact with said cam disk to arrestthe-action of said mainshaft.-

13. In a stop-motion mechanism forsewing machines a main shaft, 8.stop-motion pulley provided with a friction ring and mounted to rotatewithor independently of said shaft, a resistance flange and a cam disktight-on said main shaft, a releasinglever, a tripping dog, and ayielding disk, t he latter being provided with screws for securing it tosaid cam disk, said screws being provided with suitable springs .forholdm said yielding disk in contact with said riction ring, a brake ringprovided with studs and adapted to cooperate with said flange, incombination with a toothed disk mounted concentrically to butindependently of said main shaft and held against rotation, an opposingtoothed disk'mounted in like. mannor and operatively connected with saidrein one end of a cem lever, said cam lever be- Fail-field, and State ofConnecticut, this ing manually controlled to start the sewing 18th dayof December A. D. 1906,

machine in 0 eration, and automatically e y T cont-rolled, by the actionof said tripping 5 dog, to cause said shoe to be brought into i iContact With'said cam disk to arrest the ac- Witnesses tion of saidmachine. A. K. lVILLIAMs, J12,

Signed at Bridgeport, in the county of N. G. MARKS.

